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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f92c1bbc5a80270daf1f0084f269eb04010d09af5b29fd17de70f03f80c282a4' 
  AND token = 'sOiNlpzYhiZH4uScQWOfiC75jcbbzMEHz3ilx93nDqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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