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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd595f241cbbe12b74f97ca1efaca5abf0211eb1e6bc1dffa6426a55996477cce' 
  AND token = 'bt1l7SaO1gZqD9kpiU6HYLSERKGKTiWC81sWFTv4/ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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