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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdcf54e0d5a348a8581f8f617df6f113e1380ed4dacb90f3bb0ef6f5c2bc6075' 
  AND token = 'ZK95uM2Set4UHqBBU5e34scodTgHDmSD5vC5VWB7gCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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