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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e33b4828643fdd3e4ab42354cbe65676d7babb4a9b2719aa9cf6e0db7cd0f98' 
  AND token = 'ckLNZOnh8VG40ILZO9bMkVT0QGocdDwCS9nUSGwV6cA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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