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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0c62519bf083e1634542260bc058dd00279a402e64ac272f00666ee2aed2e28' 
  AND token = 'UaJJCwB8SbH9AHsOqCb4tXTuJUr9nb0U16Xh2efwlbw=' 
  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"
    }
  }
}