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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f58ff4e810f5718e58b0486086fde6efbb0abe60e3dedf0dc392c142dbc1d571' 
  AND token = 'n76IoXaon8WXNFTly55jHlXnxvDwAgbSjTJFzfbJOTo=' 
  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"
    }
  }
}