SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd70e91b083250c738af532f56b9a72b83cd5f8786ed5a5587184709c6cd4bb16' 
  AND token = 'CGKWN5TY/y34DjoGk+9oZXb1Hl2shk3RNvCPdoFr+JI=' 
  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"
    }
  }
}