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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a55c964975a1fa980741296d0a9935b19a49688ddc01b9d0a4b82deb55b10d1' 
  AND token = 'LkfQ9mnXnYq92w2GV1NyENKdmpE4oWdaVdsZZXHipu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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