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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2855eb1c178cacaacb74f00a1e3de4bab87669adb2512622e9dfb3f5755d628c' 
  AND token = 'YuQjLIt87W4FV0uJ4sKCb+itDABF8nyq+rmnPfjqRPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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