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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e31eb132d737765d6093b0d9419745432a99a121b0f592ef3d5c5fac76e3112d' 
  AND token = 'nD3bKCN7yWYrX1rha4Es+rP445pj4zw0tmOBqa9g9Qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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