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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '373a137fc6ace3fd32ab5dca1a5707a60237989dd4ba4d2cf22c6e8978ef2f91' 
  AND token = 'WlXShjQ46/j9aWNX5Y95hjk81dh+SIt6nFqavW8sqSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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