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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c11974d2cdc9e6712ccbb2578c54c2a9ccf331582ab6ee354f4ecdc12429f159' 
  AND token = 'eQvrl6QvlZsDeJ+7Xg6+vRXbfBopiS7dKmgi0GvwO0I=' 
  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"
    }
  }
}