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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '339c7f6d7c928098ed0d84ef63b1010f3ed6fb36bcb2ff60dbcda5b14b56b160' 
  AND token = '89ldqtdMS1ekXQC5Dvs4ZY22AJfedxec6AtOtfHu0QM=' 
  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"
    }
  }
}