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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a326d04a033fe29937fae3ffa4ab72e18cf83942ede0d9f761e868800b4c346b' 
  AND token = 'Y/q4fIeG3yiurrV8veayZPmzAWMLDS86Pcyq9Pqkx8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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