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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85b0f2045f4b4e3e0049d71a98448ba48cba038b7b13d210831a518f08a84760' 
  AND token = '+0PDxEPIOB6mZ/UM16Q81QADErLGgOGWIzXL+3TGBkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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