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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15d2f12b783ae989ebf8888e94b6dec7573baa48c010de2ffb3ad61ca3438a6a' 
  AND token = 'MMN182D08dNBxdgX7lmSkZ2R+C1/nQyzRJUrZgrPuWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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