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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b737c06b42acd4e13e40ccf53cf768172938e11ac4ebd3cee49a96001905011e' 
  AND token = 'BQ+ZHHuIFtqgfG0XeHc557Tmy5V27VW7eYIDxNwZCzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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