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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41c6b09ff2b2bdd488fc6f2b2ea28f8ffbe82227e12b524617c5acad974c2c0b' 
  AND token = 'gdpZQUBEclycLq3SxzWGa7rvsssgsjGI/JHK4oZoD6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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