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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47e176f246610f69b7f9673a8ae3280b4eda00fc6adad9e141d8ee804ee6779c' 
  AND token = '/4q89SKjOiV+1XYGeUHyvWz/4Nanbphzs18CfbapZt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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