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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '955cbde51d49216da51664a980bc8d90a9d4910c36cc7979f1e24b85dd3fae4a' 
  AND token = '0uiTPc71SJ/oK++Dl9kFl8sAP1iXUWkAuH358xx7hpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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