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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9182716a4a3eda003d87ee01c4b2296570fd3599ddc4220d8eed0a11b95c7fc' 
  AND token = 'DpJ50rqlyXWSk/aGzZuE4OKWclOzztCSeFlkenE00XU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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