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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da3fc64eb27a588841b8158c7761443c5a8c37b1902974b951feb320d36f7efc' 
  AND token = '4nL8GFi30av/HobbZ7OLTQpQ6pFOdXAb7mxV8aVc8vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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