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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad9c0a66b60854bfbbaddd68ec74416f9a107cb24d2820006412b2fb7b1b0d3d' 
  AND token = 'Y8gm9qJkUR/KZCmKMoaaRzKOqA1qfVnDoOrHu5fSB40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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