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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e234858ff9498a8928e440974637c598308160c131665c17bd0a9f38675c616' 
  AND token = 'wd/2crL5oQDIgNwxIsAzMxAGvypuyjnF0TyLPoMBEQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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