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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbb07402f44e40db77b9b7ebe1942ef74951e398316b983ae1b42605b2f33269' 
  AND token = 'dNM3ckKYbdySdbNcid3q4tLxwyWiietXwt3XQdWO3iI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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