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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72cf6bd3a950f5558022178e3c8618d11c12819551f01a67f3807426dcfd8ce2' 
  AND token = 'qy3skZhAkMvOd5QfyoUtHSxKj5SrxX4bhT+pl9d8yjg=' 
  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"
    }
  }
}