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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75fcf08b8520e83f44c49f715da5f0eedd0aa2f5e07367b5e64bd9b400d2f30d' 
  AND token = 'L+i748IGpfyEU3bO6Aeaf234CaWrV6rwL46F6Qu7Tg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}