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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a4ee67195ff00d9722cd1db39eb9d223a9d5682fc08b913d0c855adf81fcbb2' 
  AND token = '2o0biBOTC2fM7/rX8s9EPWNEa3zpIS7v3GqBiPe/acM=' 
  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"
    }
  }
}