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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac28c5547815c3738d518e09033ea53f39b971a8e7cd3e460b1c4b507139a81c' 
  AND token = 'Rqbd/AFr1rzt/apCryaWe/eT37NAyga7C9U5nVDdHwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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