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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc680744c5d7df17be8ef27f75d25ba82fe531ce02fb446dbc5f1d76b4c05d2a' 
  AND token = 'j1vjuyMhasgymlZXf47Jyf6jTSJjpMdvX2fV1i7vEr0=' 
  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"
    }
  }
}