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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abebf873c254b29d36abf7408347f9ffbf7b314ce9165a621a9ce5faa3d01ff6' 
  AND token = 'kP6iR0wPq8uuoBvXooNmR900f12I6whx8lmMIozhjBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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