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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c91c65aa8e98a752c0a7044cb9e8c035a29a5ce8e05198155a13a107521c920' 
  AND token = 'VYrUyFiFxqUL8ZZtjmMLf22UITJ2bHa3v3VYysDD2is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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