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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30406bcd8efa67e4e9d0ecf29d2f6a4ca882dfe7c9056dda74512125b56679e9' 
  AND token = '5BaawzO8UrAh2C3E3bJYJTrw84eGujRPzn4w9zYBS+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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