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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2d6ddedb81129444b96379a200154dbb11822759cc1be33bd1bc82ff3526675' 
  AND token = 'wfrHwLZ3+vEbHb4gZwhNJY9WCVX9cyk73Er72ZUBo9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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