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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f52f8d1d7fb1c4379aa232307fd4b3fc12147e7f15d4b805d22c97a2f27c10a2' 
  AND token = 'oXZxiQpjvRl3ZeSKgq9yaxb3U9SStREE1bpO5JJss4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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