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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bea0cbf8477d7d9091072d81d3102533ee25bf6c3ff33970296257c7241eca27' 
  AND token = 'gJnc2Q+2Urg9OoyMDJB5PXDEEEiD6NDl5qON22w86/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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