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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfaea9839a550eec245c5b7fda5365d47c6a14c933f3325886eb59bdee383f71' 
  AND token = 'W7Xra99mA7zn95tK3cQbf5EkeRfdiMiGunJpNu5ksX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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