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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d2106056ee7e4e5156ae54c2c6c41e3f5e15c2a81e8b17be32c61cb30baa7a3' 
  AND token = 'HIRVZacYZr3zkogmhoFJHZs9C6v3BVwnZR4GdMvV6FA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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