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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b399ff69e78c814aac1433432493511443e780790d1b30db1aa7872a77b0841d' 
  AND token = 'VZs2xNKRlLpExCCGtYT2c3D7f4r9RvmdMllm8DSdED8=' 
  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"
    }
  }
}