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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f87a9e5bc3c6cb9f32b4f230a0a4f1a43df4fb104ab315df5fb0340576d4fef' 
  AND token = 'Zs0jntuG7CA9Y8O0az9Kvwd6uNpXTF6fa3npn3pSmvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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