SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a25a7d82a93e0f22907565a17f0d03f32f3d61e4024e59ebf8b069cc5b8795ab' 
  AND token = '3vWQYNrRl9/jHuVCJzhRsCeSiUbFbQYYIfDTG9IFHo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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