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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95f05508e9f749e63d2a3d2f314fe0b754d60c91983defbd3d2f6c1d1250dd72' 
  AND token = '1ZkHdJ7MGA9w6IFS4QktuehCpk9iKhaNoqDbbhUMlc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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