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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7be5ab8ef93702a57107f0c54f490de65f2904b44f98ff169123efbf1450382' 
  AND token = 'XpGKvmTYQb/UEHwrZq0VGkCLfac6b1kigmOFt3Moeic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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