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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9389ec6d606adb2f01029d4e17525e49678d7e9a7ebd6e1ad5f7d19548009ed2' 
  AND token = 'K+4NUGtpdeQ54vx/aE65M3p0zfbhtFdJmTZ4Gr6tNEU=' 
  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"
    }
  }
}