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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '519970ea7e6d476063d493eaa73966379cfa984ddd8e6a3c71e944a1be2baedf' 
  AND token = 'MwZTi2Y6qG6qaFqeq0J8DnBrkt7NZOw5xOPsc2tJf4s=' 
  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"
    }
  }
}