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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da2d9ba5a75ce2275dfaac09ed50e1c405203e537394de87b426d3941591ff73' 
  AND token = 'a6RlwsF4s/h9xTvp/Wm045wnkPGwPuc3pR66iz1etUA=' 
  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"
    }
  }
}