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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93f5d23b537c4ba046ab55aabbef9c5e0cac49a363082066293778075a042cc1' 
  AND token = 'LuKMLNaKjy6VVEzg58nersLwdin4JgdLmOEgtiRNsNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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