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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fe03900e0114336173dae9a8e83c6f7fb1f62f7dc3fc103c7a69e559c132b6b' 
  AND token = 'O2udCTs6Jarzz1+fXZnOmBHD3ZUowlWqPrcCvelEYW4=' 
  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"
    }
  }
}