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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc26565e8502dce1777397590a0a46044b49c3d1d24b01b0c682a7ca7ff40b65' 
  AND token = 'nE/iNZPiwhBqaXP9lcS87jFe3JCi47vuXVa2mloWhmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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