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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84b12f86230337fe49086b1a9944ab0db6538db71dda0e89d123f3851a8c80ab' 
  AND token = 'g1F5V3DcQmHQ+9DIJD3t2ysYd1aOnbCsSXa+LtJza1o=' 
  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"
    }
  }
}