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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15bef9a2c7262b0710a9e990dbd1febcee5fe32995136bf3721a755ae2ed9256' 
  AND token = '2KzCvJQv6hMS0w5LoZ7RfyFOkiXl4d88pYYSy5ZPppg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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