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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8fd60c25ca2cd415bc8a57f218b5ea856896ac0223f7b358f203a739bf8fc11' 
  AND token = 'UCyjG567aSo39nG9MH8FHEGU1Z5n7uUKTY475jxCoVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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