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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96509daa84da4e9bb6434c5108e3dfbac394b9a1e1b46e28727a73ef23b304cb' 
  AND token = 'NQyxhlT71Gu4fktliQvqtpm3/UOBY9vMsZTD/skBmhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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