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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1de27d3d68246a5929e5f1e080187f0fcb6be979da4e14eb0c649e5903e56e9b' 
  AND token = '+T9yHnh1hGc5BE47JMy5wxajJs3ohx72QrRG86zVzcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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