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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '539d65a6a5d9363f3f6af4213797c2978ee2c86c5fec637f0e26d2f9e49650f1' 
  AND token = '9TsaBmD1cFII93dufW5OE33NzK1C7AHM7PszMhhpwmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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