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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '326bf39d7a071cb3b0e19f40b46f93162180fe584590f135b4290ab1d6abc0cb' 
  AND token = 's/dgvEzXumH9uL5fDu0cW2A28iyKXtRazftL4AQm9aE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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