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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c12ea4197ef242cc4e91035fc2bb65dd2e5cbf9d0fa080545aa8e04fb1baf4a5' 
  AND token = 'NDnoidGI1r8GEBpznZNBnPA5rezo9fDOMbiB/Iik6us=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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