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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b8e20ad1f4344f25da5d0520ed9790467303f9af7cd4f07987ca40aa35f6485' 
  AND token = 'bMUuiM6lOisVLKe8ncRoapka76QSt9YJ80df071803c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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