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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dc25b77e38df9207b28bc8a5c0f013510b636a34490e780a98799e1b7666907' 
  AND token = 'O8H+6ohO4YfEOkloYGRg6EUxQBJnVilfRUaS3ng7ntU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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