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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75b9b5a048f49ea96de8736dea00953d76dbe4912e0aab837cae01fa24c89e0c' 
  AND token = '54cYq1sVIC6fhvTXn3hJf5NuFQzZXdc+Q02DQRX2V5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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