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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cffe7ac71e3b5935b5dd9f173bb718912494bd8209e795b849f56acfeb9184e' 
  AND token = 'kDoMzLh2awnfFBo9j3H0HZOaWsSG5ViVQm7fNc3Zzsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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