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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '433f57c3efe360eda85a4ce539a19ff3e13ac8d89768c14fac4baad6d633da6a' 
  AND token = '7gi+dgGh0i6vcUhzxpb+GHICaf8cF0EaxVY5FSUi1SY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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