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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64fd11951b3b40c615efa8d88d7e5d994769122155c69c0c2da4e2941eb6a3bd' 
  AND token = 'T+gZlJTYAHec5L8A7UzaCSpJp5l6v39Z/9osxdXk4ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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